After finally doing a bunch of updates, suddenly every now and then some random lock screen with ads showed.

Lock screen with friggin' ads

Which app is causing this?

merged by Dan Hulme May 20 '16 at 13:48

This question was merged with Weird display on screen before swipe lock Samsung Galaxy s6 edge plus because it is an exact duplicate of that question.

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    Agreed, as long as no one marks this one as a duplicate.. The above one points to ES Explorer being the culprit, and is older. This is a (slightly) newer phenomenon. – DaJF May 20 '16 at 12:06